sink = graph.add_component(MySink, 'sink')
conn = graph.connect_ports(src.output_ports['out'], sink.input_ports['in'])
self.assertEqual(conn.downstream_port.addr, sink.input_ports['in'].addr)
sink = graph.add_component(MySink, 'sink')
conn = graph.connect_ports(src.output_ports['out'], sink.input_ports['in'])
self.assertEqual(conn.downstream_port.addr, sink.input_ports['in'].addr)